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Help mailcow

Let us know about your ideas in #mailcow @ Freenode.

Servercow - hosted mailcow, KVM based virtual servers, web-hosting and more.

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💡 Entwickler gesucht!

Wir möchten die Kuh clustern und noch sicherererer machen, daher suchen wir dringend Entwickler, die dabei unterstützen. Bis hin zur Festanstellung alle Möglichkeiten offen. Bitte meldet euch bei

Get support

Commercial support

For commercial support contact or get a support subscription at Servercow.

A fully featured managed mailcow is also available here.

Community support


You can find a demo at, use the following credentials to login:

  • Administrator: admin / moohoo
  • Domain administrator: department / moohoo
  • Mailbox: / moohoo


The integrated mailcow UI allows administrative work on your mail server instance as well as separated domain administrator and mailbox user access:

  • DKIM and ARC support
  • Black- and whitelists per domain and per user
  • Spam score management per-user (reject spam, mark spam, greylist)
  • Allow mailbox users to create temporary spam aliases
  • Prepend mail tags to subject or move mail to sub folder (per-user)
  • Allow mailbox users to toggle incoming and outgoing TLS enforcement
  • Allow users to reset SOGo ActiveSync device caches
  • imapsync to migrate or pull remote mailboxes regularly
  • TFA: Yubi OTP and U2F USB (Google Chrome and derivatives only), TOTP
  • Add domains, mailboxes, aliases, domain aliases and SOGo resources
  • Add whitelisted hosts to forward mail to mailcow
  • Fail2ban-like integration
  • Quarantine system
  • A lot more...

mailcow: dockerized comes with multiple containers linked in one bridged network. Each container represents a single application.

  • Dovecot
  • ClamAV (optional)
  • Solr (optional)
  • Memcached
  • Redis
  • MySQL
  • Unbound (as resolver)
  • Postfix
  • ACME-Client (thanks to @bebehei)
  • Nginx
  • Rspamd
  • SOGo
  • Netfilter (Fail2ban-like integration by @mkuron)
  • Watchdog (basic monitoring)

Docker volumes to keep dynamic data - take care of them!

  • vmail-vol-1
  • solr-vol-1
  • redis-vol-1
  • mysql-vol-1
  • rspamd-vol-1
  • postfix-vol-1
  • crypt-vol-1